Color schemes is something that we plan to add in a future update. In the meantime, you can adjust the colors to your hearts content by using a web browser plugin called Stylish, but you'll have to learn a little CSS first. For example, to make the red color pink instead you would make this custom rule

Oh my. Yes, PLEASE MAKE A COLOR CHOICE OPTION!!!!! Its not really useful for a new task to be highlighted green. It would probably change my life/save my career if I could opt to have all my work tasks highlighted in green, etc. PLEASE PLEASE PLEASE PLEASE insert this function!!!!!!!!!!!!!!